Basic Operating System MCQ

Basic Operating System MCQ
481. Thrashing
  • reduces page I/O
  • Decrease the degree of multi-programming
  • Implies execessive page I/O
  • Improve the system performance
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482. Dirty bit for a page in a page table
  • helps avoid unnecessary writes on a paging device
  • helps maintain LRU information
  • allows only read on a page
  • none of the above
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483. A set of resources allocations such that the system can allocatte resources to each process is some order, and still avoid a dead lock is called
  • unsafe state
  • safe state
  • Starvation
  • Greedy allocation
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484. A disk sheduling algorithm in an operating system causes the disk arm to seek back and forth access the disc surface servicing all request in its path, this is a
  • first come first served
  • shortest seek time first
  • scan
  • None of these
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485. An attached processor
  • is used one only a few computers
  • causes all processor to function equally
  • is more difficult to implement than a co-processor
  • is used only for limited, specific functions
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486. Process is
  • a program in high level language kept on disk
  • contents of main memory
  • a program in execution
  • a job in secondary memory
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487. Situations where two or more processes are reading or writing some shared data and the final result depends on who runs precisely whch are called
  • race condition
  • critical sections
  • mutual exclusions
  • message passing
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488. Producer consumer problem can be solved using
  • Semaphores
  • Event counters
  • Monitors
  • All of the above
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489. The strategy of allowing process that are logically run able to be temporarily suspended is called
  • preemptive scheduling
  • Non premptive scheduing
  • Shortest job first
  • First come first served
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490. Moving process from main memory to disk is called
  • Scheduing
  • Cache
  • Swapping
  • Spooling
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